<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
      <!-- 章节 -->
      <ul class="chanpterList">
          <li
              v-for="chapter in chapterVideoList"
              :key="chapter.id">
              <p>
                  {{ chapter.title }}

                  <span class="acts">
                      <el-button type="text" @click="openVideoDialog(chapter.id)">添加课时</el-button>
                      <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                      <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                  </span>
              </p>

              <!-- 视频 -->
              <ul class="chanpterList videoList">
                  <li
                      v-for="video in chapter.children"
                      :key="video.id">
                      <p>{{ video.title }}
                          <span class="acts">
                              <el-button type="text" @click="openEditVideo(video.id)">编辑</el-button>
                              <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                          </span>
                      </p>
                  </li>
              </ul>
          </li>
      </ul>
      <div>
          <el-button @click="previous">上一步</el-button>
          <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </div>
      <!-- 添加和修改章节表单 -->
      <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
          <el-form :model="chapter" label-width="120px">
              <el-form-item label="章节标题">
                  <el-input v-model="chapter.title"/>
              </el-form-item>
              <el-form-item label="章节排序">
                  <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
              </el-form-item>
          </el-form>
          <div slot="footer" class="dialog-footer">
              <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
              <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
          </div>
      </el-dialog>
      <!-- 添加和修改课时表单 -->
      <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
        <el-form :model="video" label-width="120px">
          <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
          </el-form-item>
          <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
          </el-form-item>
          <el-form-item label="是否免费">
            <el-radio-group v-model="video.isFree">
              <el-radio :label="0">收费</el-radio>
              <el-radio :label="1">免费</el-radio>
            </el-radio-group>
          </el-form-item>
          <el-form-item label="上传视频">
              <el-upload
                    :on-success="handleVodUploadSuccess"
                    :on-remove="handleVodRemove"
                    :before-remove="beforeVodRemove"
                    :on-exceed="handleUploadExceed"
                    :file-list="fileList"
                    :action="BASE_API+'/eduvod/video/uploadAlyVideo'"
                    :limit="1"
                    class="upload-demo">
              <el-button size="small" type="primary">上传视频</el-button>
              <el-tooltip placement="right-end">
                  <div slot="content">最大支持1G，<br>
                      支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                      GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                      MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                      SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                  <i class="el-icon-question"/>
              </el-tooltip>
              </el-upload>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
          <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
      </el-dialog>
  </div>

</template>
<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
export default {
    data(){
        return{
            saveBtnDisabled: false,
            chapterVideoList: [],
            courseId: '',
            dialogChapterFormVisible:false,
            dialogVideoFormVisible:false,
            chapter:{
                title: '',
                sort: 0
            },
            video:{
                title: '',
                sort: 0,
                isFree: 0,
                videoSourceId: '',
                videoOriginalName:''
            },
            fileList: [],//上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址

        }
    },
    created(){
      //获取路由id
      if(this.$route.params && this.$route.params.id){
        this.courseId = this.$route.params.id
        this.getChapterVideo()
      }
    },
    methods:{
//===================================小节操作============================================
        openEditVideo(videoId){
          this.fileList = []
          this.dialogVideoFormVisible = true
          video.getVideoInfoById(videoId)
            .then(response => {
              this.video = response.data.eduVideo
              if(this.video.videoSourceId){
                this.fileList.push({
                  id:this.video.videoSourceId,
                  name:this.video.videoOriginalName
                })
              }
              if(this.video.isFree === false){
                  this.video.isFree = 0
              }else{
                  this.video.isFree = 1
              }
            })
        },
        removeVideo(videoId){
          this.$confirm('此操作将永久删除该课时, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                video.deleteVideoById(videoId)
                  .then(response => {
                    this.$message({
                        type: 'success',
                        message: '删除课时成功!'
                    });
                    this.getChapterVideo()
                  })
            })

        },
        openVideoDialog(chapterId){
          this.video = {
                title: '',
                sort: 0,
                isFree: 0,
                videoSourceId: '',
                videoOriginalName: ''
          }
          this.fileList = []
          this.dialogVideoFormVisible = true
          //章节id
          this.video.chapterId = chapterId
        },
        addVideo(){
          //课程id
          this.video.courseId = this.courseId
          video.addVideo(this.video)
            .then(response =>{
              this.dialogVideoFormVisible = false
              this.$message({
                  type: 'success',
                  message: '添加课时成功!'
              });
              this.getChapterVideo()
            })
        },
        updateVideo(){
          video.updateVideo(this.video)
            .then(response =>{
              this.dialogVideoFormVisible = false
              this.$message({
                  type: 'success',
                  message: '修改课时成功!'
              });
              this.getChapterVideo()
            })
        },

        saveOrUpdateVideo(){
          if(!this.video.id){
            this.addVideo()
          }else{
            this.updateVideo()
          }
        },
//===================================章节操作============================================
        beforeVodRemove(file, fileList) {
          return this.$confirm(`确定移除 ${file.name}？`)
        },
        handleVodRemove(file, fileList) {
          video.removeById(this.video.videoSourceId).then(response=>{
            this.$message({
              type: 'success',
              message: "删除视频成功"
            })
            //把文件列表清空
            this.fileList = []
            this.video.videoSourceId = ''
            this.video.videoOriginalName = ''
          })
        },
        //成功回调
        handleVodUploadSuccess(response, file, fileList) {
          this.video.videoSourceId = response.data.videoId
          this.video.videoOriginalName = file.name
        },
        //视图上传多于一个视频
        handleUploadExceed() {
          this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
        removeChapter(chapterId){
          this.$confirm('此操作将永久删除该章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                chapter.deleteChapterById(chapterId)
                  .then(response => {
                    this.$message({
                        type: 'success',
                        message: '删除章节成功!'
                    });
                    this.getChapterVideo()
                  })
            })
        },
        openEditChapter(chapterId){
          this.dialogChapterFormVisible = true
          chapter.getChapterInfo(chapterId)
            .then(response => {
              this.chapter = response.data.chapterInfo
            })
        },
        openChapterDialog(){
          this.dialogChapterFormVisible = true
          this.chapter = {
                title: '',
                sort: 0
            }
        },
        addChapter(){
          this.chapter.courseId = this.courseId
          chapter.addChapter(this.chapter)
            .then(response => {
              this.dialogChapterFormVisible = false
              this.$message({
                  type: 'success',
                  message: '添加章节成功!'
              });
              this.getChapterVideo()
            })
        },
        updateChapter(){       
          chapter.updateChapter(this.chapter)
            .then(response => {
              this.dialogChapterFormVisible = false
              this.$message({
                  type: 'success',
                  message: '修改章节成功!'
              });
              this.getChapterVideo()
            })

        },
        saveOrUpdate(){
          if(!this.chapter.id){
            this.addChapter()
          }else{
            this.updateChapter()
          }
        },
        //根据课程id查询章节和小节
        getChapterVideo(){
          chapter.getChapterVideo(this.courseId)
            .then(response => {
              this.chapterVideoList = response.data.allChapterVideo
            })
        },
        previous(){
            this.$router.push({path:'/course/info/'+this.courseId})
        },
        next(){
            //跳转到第二步
            this.$router.push({path:'/course/publish/'+this.courseId})
        }

    }
}
</script>
<style scoped>
  .chanpterList{
      position: relative;
      list-style: none;
      margin: 0;
      padding: 0;
  }
  .chanpterList li{
    position: relative;
  }
  .chanpterList p{
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }
  .chanpterList .acts {
      float: right;
      font-size: 14px;
  }

  .videoList{
    padding-left: 50px;
  }
  .videoList p{
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
  }

</style>
